Abstract: The invention concerns a filter media having an improved efficiency, dust loading capacity and quality factor. The filter media comprises at least a corrugated self-supporting downstream layer 110 and at least an upstream layer 120. The downstream layer 110 comprises a corrugated fine fiber layer 111 consisting of fibers having a mean fiber diameter of less than 3 micrometers. The upstream layer 120 comprises a dust holding layer 122 with fibers having a mean fiber diameter of less than 5 micrometers.

Abstract: The present invention relates to a filter medium, a method for the manufacture thereof and the use of the filter medium according to the invention. The filter medium according to the invention comprises at least two textile nonwoven layers which are joined to one another by needling. The needled composite is then subjected to an after treatment so that the holes present from the needling are reduced by at least 50%.

Abstract: The invention relates to a compressed-air supply system for operating a pneumatic installation in a pneumatic system of a vehicle, comprising: a compressed-air feed; a compressed-air connection point to the pneumatic installation; a venting connection point to the environment; a pneumatic main line between the compressed-air feed and the compressed-air connection point, which pneumatic main line has an air dryer; a venting valve, which is arranged on the pneumatic main line and is designed as a pilot valve and has a pilot connection point; a compressor having at least one compressor stage; and, in addition to the pneumatic main line, a pilot valve and a pneumatic pilot channel that connects the pilot valve to the pilot connection point of the venting valve.

Abstract: A controlled air spring system with a compressed air supply for height regulation of a vehicle includes a number of air springs and a reservoir for the storage of compressed air, a number of switching valves for height regulation, and a controller configured to actuate the number of switching valves. The at least one switching valve is actuated with a number of sequential switching periods and switches over in a switching period, between a first switching state with an open valve state and a second switching state with a closed valve state, the switching period of the number of sequential shifting periods having the open valve state and the closed valve state. The controller is configured to set a speed for a height change of the height regulation. The setting of the speed takes place via an open/closed parameter.

Abstract: The invention relates to a compressed-air supply system for operating a pneumatic installation in a pneumatic system of a vehicle, comprising: a compressed-air feed; a compressed-air connection point to the pneumatic installation; a venting connection point to the environment; a pneumatic main line between the compressed-air feed and the compressed-air connection point, which pneumatic main line has an air dryer; a venting valve, which is arranged on the pneumatic main line and is designed as a pilot valve and has a pilot connection point; a compressor having at least one compressor stage; and, in addition to the pneumatic main line, a pilot valve and a pneumatic pilot channel that connects the pilot valve to the pilot connection point of the venting valve.

Abstract: A compressed air supply installation includes a compressed air supply, a compressed air port to a pneumatic installation, a vent port to a venting environment, and a pneumatic main line between the compressed air supply and the compressed air port. The pneumatic main line includes an air dryer. The installation further includes a vent valve arranged in the pneumatic main line, the vent valve being a first pilot valve having a pilot control port, a compressor having at least one compressor stage, and a second pilot valve and a pneumatic pilot control channel that pneumatically connects the second pilot valve to the pilot control port of the first pilot valve. A pressure-holding pneumatic valve device is connected to the pilot control port of the first pilot valve and is configured to provide a control pressure for the pilot control port of the first pilot valve.

Abstract: The present invention relates to a cleanable 3D filter medium, a method for manufacturing said filter and the use of the filter. The filter medium according to the present invention comprises at least one textile layer being a non-woven of synthetic, organic polymer fibers. The nonwoven having an embossed pattern in which the nonwoven having at the non-embossed area a thickness D and at the embossed area a thickness d and the ratio d/D is the compression factor CF, said compression factor CF being in the range 0.2?FC?0.5. The filter medium according to the present invention can be cleaned and are used in filter systems for air/gas and liquid filtration, particularly in the motor vehicle industry, in air conditioning systems, passenger compartment filters, pollen filters, clean room filters, domestic filters, and as oil filters and hydraulic filters, thus removing solids from air/gas and liquids.

Abstract: A compressed-air feed system for operating a pneumatic system includes a compressed-air supply, a compressed-air connection to the pneumatic system, at least one ventilation connection to surroundings, and a pneumatic main line between the compressed-air supply and the compressed-air connection. The pneumatic main line has an air dryer and a regeneration throttle. The compressed-air feed system further includes a first ventilation line between the pneumatic main line and the at least one ventilation connection. The first ventilation line has a first ventilation valve and a ventilation throttle. The compressed-air feed system additionally includes a second ventilation line between the compressed-air connection and the at least one ventilation connection. The second ventilation line has a second ventilation valve formed as a 2/2 directional valve. The compressed-air feed system is designed to provide an operating mode in which the second ventilation valve is open over a predetermined time period.

Abstract: A compressed air supply installation includes a compressed air supply, a compressed air port to a pneumatic installation, a vent port to a venting environment, and a pneumatic main line between the compressed air supply and the compressed air port. The pneumatic main line includes an air dryer. The installation further includes a vent valve arranged in the pneumatic main line, the vent valve being a first pilot valve having a pilot control port, a compressor having at least one compressor stage, and a second pilot valve and a pneumatic pilot control channel that pneumatically connects the second pilot valve to the pilot control port of the first pilot valve. A pressure-holding pneumatic valve device is connected to the pilot control port of the first pilot valve and is configured to provide a control pressure for the pilot control port of the first pilot valve.

Abstract: A compressed-air feed system for operating a pneumatic system includes a compressed-air supply, a compressed-air connection to the pneumatic system, a ventilation connection to surroundings, and a pneumatic main line between the compressed-air supply and the compressed-air connection. The pneumatic main line has an air dryer and a regeneration throttle. The compressed-air feed system further includes a ventilation line between the pneumatic main line and the ventilation connection. The ventilation line has a ventilation valve and a ventilation throttle. The compressed-air feed system further includes a bypass line between the compressed-air connection and the air dryer. The bypass line has a bypass valve formed as a 2/2 directional valve configured to permit an air flow conducted via the air dryer, and bypassing the regeneration throttle, for filling and ventilating the pneumatic system.

Abstract: A method for operating an electronically controllable air spring system having air springs includes ascertaining a vehicle velocity of a vehicle and performing a procedure of monitoring a loading procedure and/or a procedure of monitoring an unloading procedure if the vehicle velocity indicates that the vehicle is at a standstill. The method further includes suppressing a level control procedure via the air spring system for a determined time period if at least one pressure difference that is allocated to the air springs exceeds the respective loading pressure limit difference or undercuts the unloading pressure difference and/or a loading criterion or an unloading criterion are met.

Abstract: A compressed-air feed system for operating a pneumatic system includes a compressed-air supply, a compressed-air connection to the pneumatic system, a ventilation connection to surroundings, and a pneumatic main line between the compressed-air supply and the compressed-air connection. The pneumatic main line has an air dryer and a regeneration throttle. The compressed-air feed system further includes a ventilation line between the pneumatic main line and the ventilation connection. The ventilation line has a ventilation valve and a ventilation throttle. The compressed-air feed system further includes a bypass line between the compressed-air connection and the air dryer. The bypass line has a bypass valve formed as a 2/2 directional valve configured to permit an air flow conducted via the air dryer, and bypassing the regeneration throttle, for filling and ventilating the pneumatic system.

Abstract: A compressed-air feed system for operating a pneumatic system includes a compressed-air supply, a compressed-air connection to the pneumatic system, at least one ventilation connection to surroundings, and a pneumatic main line between the compressed-air supply and the compressed-air connection. The pneumatic main line has an air dryer and a regeneration throttle. The compressed-air feed system further includes a first ventilation line between the pneumatic main line and the at least one ventilation connection. The first ventilation line has a first ventilation valve and a ventilation throttle. The compressed-air feed system additionally includes a second ventilation line between the compressed-air connection and the at least one ventilation connection. The second ventilation line has a second ventilation valve formed as a 2/2 directional valve. The compressed-air feed system is designed to provide an operating mode in which the second ventilation valve is open over a predetermined time period.

Abstract: A method for operating an electronically controllable air spring system having air springs includes ascertaining a vehicle velocity of a vehicle and performing a procedure of monitoring a loading procedure and/or a procedure of monitoring an unloading procedure if the vehicle velocity indicates that the vehicle is at a standstill. The method further includes suppressing a level control procedure via the air spring system for a determined time period if at least one pressure difference that is allocated to the air springs exceeds the respective loading pressure limit difference or undercuts the unloading pressure difference and/or a loading criterion or an unloading criterion are met.

Abstract: An opto-isolator is provided that is designed for optically interconnecting devices that are mounted on multiple PCBs. The opto-isolator is particularly well suited for arrangements where the PCB-to-PCB distance is very small. In such cases, using an optical fiber as the optical waveguide can result in the optical fiber being bent beyond its minimum bend radius, resulting in damage to the optical fiber and/or performance problems due to attenuation of the optical signal. The opto-isolator includes first and second generally rigid structures that engage one another with an alignment tolerance that ensures proper board-to-board alignment while also facilitating the ease with which the alignment process can be performed. Once the first and second generally rigid structures are in engagement with one another, they form a generally rigid optical waveguide structure for coupling light from an optical transmitter of one of the PCBs onto an optical receiver of the other PCB.

Abstract: The present invention relates to a filter medium, a method for the manufacture thereof and the use of the filter medium according to the invention. The filter medium according to the invention comprises at least two textile nonwoven layers which are joined to one another by needling. The needled composite is then subjected to an aftertreatment so that the holes present from he needling are reduced by at least 50%.

Abstract: In an opto-isolator, a nontransparent hollow tube having a smooth inner surface with mirror-like qualities is used as the optical waveguide for coupling optical signals between the transmitter module and the receiver module and for providing electrical transient isolation.

Abstract: In an opto-isolator, a nontransparent hollow tube having a smooth inner surface with mirror-like qualities is used as the optical waveguide for coupling optical signals between the transmitter module and the receiver module and for providing electrical transient isolation.